"I think foreign observers are troubled by some of the rhetoric that's been taking place in these Republican primaries and Republican debates," Obama said when asked what foreign leaders thought of Donald Trump.

Obama emphasized that his comments were not directed solely at Trump, the Republican presidential front-runner.

The president listed multiple issues, including climate change and immigration, on which he thought all of the GOP candidates were out of step:

"I find it interesting that everybody's focused on Trump primarily just because he says in more interesting ways what the other candidates are saying as well. So he may up the ante in anti-Muslim sentiment but if you look at what the other Republican candidates have said, that's pretty troubling too. He may express strong anti-immigration sentiment, but you've heard that from the other candidates as well.

They're all denying climate change. I think that's troubling to the international community since the science is unequivocal. And, you know, the other countries in the world, they kind of count on the United States being on the side of science and reason and common sense. ... But this is not just Mr. Trump. Look at the other statements that are being made by the other candidates."

By linking Trump's provocative statements and policies to the other GOP candidates, Obama echoed the Democratic Party's broader messaging.

Click through for a behind-the-scenes look at Obama's tenure as president:

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44 behind-the-scenes images of Barack Obama's tenure as president

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'Mr. Trump will not be president': Obama unloads on the entire Republican 2016 field

White House photographer Pete Souza took this photo of President-elect Barack Obama moments before Obama took the oath of office. (Photo by Pete Souza/The White House)

President Obama and first lady Michelle Obama shared a moment at the Inaugural Ball on January 20, 2009. (Photo by Pete Souza/The White House)

The next day, Obama entered the Oval Office to begin his first full day as America's 44th president. (Photo by Pete Souza/The White House)

Obama reads a letter that former President George W. Bush left for him in the Oval Office's resolute desk. Leaving a letter for the incoming president has become a White House tradition. (Photo by Pete Souza/The White House)

The Obamas posed for their first holiday portrait in front of the official White House Christmas tree. (Photo by Pete Souza/The White House)

At the beginning of the new year, White House photographer Pete Souza took this photo of Obama meeting with members of his cabinet. The president's chair is marked with a plaque engraved with his inauguration date. (Photo by Pete Souza/The White House)

The Obamas danced during the Governors' Ball held in the East Room of the White House. (Photo by Pete Souza/The White House)

Obama reads some documents while waiting for Marine One at the Westchester County Airport in New York. (Photo by Pete Souza/The White House)

Obama speaks with a congressman about the healthcare-reform bill. "In those final days before the vote, the President made hundreds of calls," wrote White House photographer Pete Souza. (Photo by Pete Souza/The White House)

Alongside White House staff and Vice President Joe Biden, Obama clapped while watching the historic House vote to pass the Affordable Care Act. (Photo by Pete Souza/The White House)

Obama boarded Air Force One while the sun set at Miami International Airport. (Photo by Pete Souza/The White House)

The Obamas pretended to sing with an a capella group after a holiday tour of the White House. (Photo by Pete Souza/The White House)

"A lighter moment during a meeting in the Situation Room of the White House," Souza wrote. (Photo by Pete Souza/The White House)

Obama shook hands with US soldiers at Bagram Airfield after an all-night, unannounced flight to Afghanistan in December 2010. (Photo by Pete Souza/The White House)

The Obamas stared at Rio de Janeiro's famous Christ the Redeemer statue while visiting Brazil in March 2011. (Photo by Pete Souza/The White House)

Obama saluted a Marine while walking toward Marine One helicopter on the South Lawn of the White House. (Photo by Pete Souza/The White House)

Taken on May 1, 2011, from the White House Situation Room, Obama's national-security team monitored the real-time mission against Osama bin Laden. Souza took approximately 100 photographs during this confidential meeting. (Photo by Pete Souza/The White House)

"The president was ready to announce the news about the mission against Osama bin Laden and was putting the finishing touches on his statement in the Outer Oval Office. As he did so, the networks broke in with bulletins confirming that bin Laden had been killed and a photograph of him appeared on the television screen in the background near the Vice President and Press Secretary Jay Carney," Souza wrote. (Photo by Pete Souza/The White House)

"One of the most memorable moments of the year was when the president hugged Rep. Gabrielle Giffords as he walked onto the floor of the House Chamber at the US Capitol to deliver his annual State of the Union address," Souza wrote in January 2012. Giffords was shot in a 2011 mass shooting in Arizona. (Photo by Pete Souza/The White House)

"The President hugs the first lady after she had introduced him at a campaign event in Davenport, Iowa. The campaign tweeted a similar photo from the campaign photographer on election night and a lot of people thought it was taken on election day," Souza wrote. When the campaign tweeted it on election night, it became the most retweeted photo of all time. (Photo by Pete Souza/The White House)

Obama kissed the first lady for the "kiss cam" during the US men's Olympic basketball team's game against Brazil in Washington, D.C. (Photo by Pete Souza/The White House)

Obama sang "Happy Birthday" to Michelle in the Blue Room of the White House in 2013. Her new hairstyle attracted a lot of attention. (Photo by Pete Souza/The White House)

In this photo, Obama sits in front of cameras taking images that will later make a 3D portrait for the Smithsonian Institution. (Photo by Pete Souza/The White House)

"We were at the NATO Summit in Wales when someone mentioned to the President that Stonehenge wasn't that far away. 'Let's go,' he said. So when the Summit ended, we took a slight detour on the way back to Air Force One," Souza wrote in September 2014. (Photo by Pete Souza/The White House)

Obama laughed as he and Michelle recorded a holiday video message in the Map Room of the White House. (Photo by Pete Souza/The White House)

This March 2015 photo shows Obama delivering remarks during an event to commemorate the 50th Anniversary of Bloody Sunday and the Selma to Montgomery civil-rights marches. (Photo by Pete Souza/The White House)

Obama shook hands with President Raúl Castro of Cuba during the Summit of the Americas on April 11, 2015. The US and Cuba have moved toward a historic thaw in relations over the past year. (Photo by Pete Souza/The White House)

Vice President Joe Biden announced he would not seek the 2016 Democratic presidential nomination in October, as Obama stood by his side during an appearance in the Rose Garden of the White House. (AP Photo/Jacquelyn Martin)

In this November 2015 photo, Obama collects a folder holding the bipartisan Budget Act of 2015 after signing it into law in the Oval Office. (AP Photo/Andrew Harnik)

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However, it was clear from the press conference that Obama viewed Trump with particular disdain. Obama predicted that Trump would not win the 2016 presidential race because the American electorate is too sober to place him in such an important position.

"I continue to believe Mr. Trump will not be president. And the reason is because I have a lot of faith in the American people. And I think that they recognize that being president is a serious job," Obama said.

"It's not hosting a talk show or a reality show," he added. "It's not promotion. It's not marketing. It's hard. And a lot of people count on us getting it right. And it's not a matter of pandering and doing whatever will get you in the news on a given day."

At a rally on Tuesday evening, Trump fired back, saying that Obama was "lucky" the reality-television star didn't run for president in 2012.

"This man has done such a bad job, he has set us back so far. For him to say that is a great compliment, to tell you the truth," Trump said. "You're lucky I didn't run last time when Romney ran, because you would've been a one-term president."